Biocidal and catalytic efficiency of ruthenium(III) complexes with tridentate Schiff base ligands

Article abstract of DOI:10.1002/aoc.1647

The reaction of the Schiff bases (obtained by condensing isatin with o-aminophenol/o-aminothiophenol/o-aminobenzoic acid) with [RuX ₃(EPh₃)₃] (where X = Cl/Br; E = P/As) in benzene afforded new, air-stable Ru(III) complexes of the general formula [Ru(L)X(EPh₃)₂] (L = dianion of tridentate Schiff bases). In all these reactions, the Schiff base ligand replaces one triphenylphosphine/ triphenylarsine and two chlorides/bromides from the ruthenium precursors. The complexes were characterized by elemental analyses, spectral (FT-IR, UV-vis,¹H and ¹³C NMR for the ligands, and EPR) and electrochemical studies. All the metal complexes exhibit characteristic LMCT absorption bands in the visible region. The catalytic reactivity proved these complexes to be efficient catalysts in the oxidation of alcohols and C-C coupling. All the complexes were screened for their biocidal efficiency against bacteria such as Staphylococcus epidermidis and Escherichia coli and fungi such as Botrytis cinerea and Aspergillus niger at 0.25,0.50 and 1 % concentrations.